Recent visitors gushed over the rainbow array of the spring ... Access to the Grand Prismatic Spring is included in Yellowstone's seven-day pass ($35) and there are no set hours of operation.

focusing on Yellowstone's geothermal features. While wide-eyed enthusiasts come from far and wide to see the dazzling rainbow colors of the Grand Prismatic Spring or dependable bursts of Old ...

Yellowstone is known for its explosive natural wonders. Just a few hours away, Wyoming's Hot Springs State Park boasts many ...

These marvels are a must-see when you're in Yellowstone, especially its largest, rainbow-colored Grand Prismatic Spring. But don't be fooled by these stunning hot springs—they're extremely ...

Habitat for the fish on Mill Creek has been impacted by historical mining, logging and livestock grazing that took place in ...

As the headquarters of Yellowstone National Park, the Mammoth Springs Historic District is also home to historic buildings, including structures that date back from the Fort Yellowstone days ...

Editor’s Note: This story accompanies the May 2016 issue of National Geographic magazine, devoted entirely to America’s first national park. Find more at natgeo ...

Pray, Montana, is a small community tucked just off the highway 30 miles north of Yellowstone National Park. There lies Chico Hot Springs Resort, a steamy oasis for travelers and locals to soak ...

Their images helped influence Congress to make Yellowstone the first National Park. Smithsonian American Art Museum Rainbow over the Grand Canyon of the Yellowstone Smithsonian American Art Museum Old ...

Trout Unlimited is proposing to complete the second phase of work to create better fish spawning and rearing habitat on Mill ...